History of the Royal Regiment of Artillery
An excellent set of books were (and are still being) published covering the history of the Gunners from WW1 through to the mid 50s. They also cover Indian, Australian, NZ and Canadian Army units along with some others. They are all published under the auspices of the Royal Artillery Institution in the History of the Royal Regiment of Artillery series.
They are very useful books for those researching their ancestors or Battery history.
See also An ancestor in The Royal Artillery you say? for other information on this.
Western Front, 1914-18, Gen Sir Martin Farndale KCB, 1986, RAI, ISBN 1 870114 00 0
The Forgotten Fronts & the Home Base, 1914-18, Gen Sir Martin Farndale KCB, 1988, RAI, ISBN 1 870114 05 1
Anti-Aircraft Artillery, 1914-55, Brig NW Routledge OBE TD, 1994, Brassey's, ISBN 1 857753 099 3 Hardcover
Between the Wars, 1919-39, editor Maj Gen BP Hughes CB CBE, 1992, Brassey's, ISBN 0 08 040984 9
The Years of Defeat, 1939-41, Gen Sir Martin Farndale KCB, 1996, Brassey's, ISBN 1 85753 080 2 Hardcover
The Far East Theatre, 1941-46, Gen Sir Martin Farndale KCB, 2002, Brassey's, ISBN 1 85753 331 3